A traffic stop on Saint Patrick's Day in Massachusetts led to the arrests of two Maine men and the discovery of a load of heroin, police said.

Both Maine men, ages 31 and 26, along with a 26-year-old man from Springfield, Massachusetts, face numerous charges, including trafficking in heroin and conspiracy to violate drug laws, Massachusetts State Police said in a press release.

The Chevrolet Tracker the men were riding in was pulled over by police on Route 91 in Longmeadow due to an unreadable license plate, the release said.

Police said none of the men had driver's licenses, and the drugs were found during an inventory check of the vehicle before it was towed.

The release said the men had just purchased the heroin, and they were on their way back to Maine from Hartford, Connecticut.

The men were transported to the state police barracks in Springfield.

The driver, the 31 year old from Maine, was also charged with driving without a license and not having a visible license plate.